On 25/02/2014 02:47, Michael Ellerman wrote: > On Mon, 2014-02-24 at 17:30 +0100, Laurent Dufour wrote: >> In copy_oldmem_page, the current check using max_pfn and min_low_pfn to >> decide if the page is backed or not, is not valid when the memory layout is >> not continuous. >> >> This happens when running as a QEMU/KVM guest, where RTAS is mapped higher >> in the memory. In that case max_pfn points to the end of RTAS, and a hole >> between the end of the kdump kernel and RTAS is not backed by PTEs. As a >> consequence, the kdump kernel is crashing in copy_oldmem_page when accessing >> in a direct way the pages in that hole. >> >> This fix relies on the memblock's service memblock_is_region_memory to >> check if the read page is part or not of the directly accessible memory. > > Hi Laurent, > > This looks good to me, assuming you've tested it on a PowerVM system as well > as > under KVM.
Hi Michael, Yes I tested it on PowerVM (BE), KVM (BE) and Qemu TCG (BE). Cheers, Laurent. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
